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@nitro tatrs jatrnt @ffies RIGHARl) MONTGOMERY AND MARY J. MONTGOMERY,Oh NEW YORK, N. Y.

Lettere Patent No. 81,666, datent September 1, 1868.

IMPROVEMENT IN BRIDGES.

TO ALL WHOM- I'l MAY CONCERN:

Be it known that we, RIcnAnp MONTGOMERY andv MARY J. MONTGOMERY, ofthecity, county, and State of New York, have invented certain new anduseful Improvements in the'Form, Construction, and Arrangement of Beamsand Columns for Bxjdges and other Structures; and we do hereby declare`the following to be a. full and exact description thereof, `referencebeing had tothe accompanying drawings, forming a part of thisspecieation, in which- Figure 1 represents our invention as applied inthe construction of a bridge.

Figure 3, 'its application in u. column for building purposes, and thesupport of elevated structures, and

Figure 2 isen enlarged-vertical section in the line :o :e of iig. 1. l

The nature of our said invention consists, first, of an improvement inthe construction of double-cerrugated beams and columns, by theinsertion or interposition of a. plain, longitudinal binding-platebetween the two opposite faces of 4the double longitudinally-corrugatedplates, constituting said beams and columns; and,

second, in e novel combination of the diagonal stays or vbraces ofbridges, roofs, and similar structures with said double-eorrugatedbeamsand bolumns,by causing the said stays or braces to pass through, betweenthe lopposite faces ofthedouble-corrugated plates, forming'said beamsand columns, as will be more fullyshown.

In the accompanying dra-winrgmrA A represent metallic plates, corrugatedlongitudinally in double folds. Where thegreatest possible strength isdesired, each fold is increased in thickness at its curve a, as shown iniig.` 2. Such plates A A, when united with their outer edgesfacel toface, possess'immense strength in proportion to their weight inresisting any strain having a tendency to bend or break them in a planecoincident with the direction of their folds, but they are comparativelydeficient in strength in adirection 'at right angles thereto, from thefac-t that they-receive no support in that direction, and that the foldsare liable to spread openand apart when unduly strained. To obviatc thisdefect, and'to equalize the strength of the double corrugated beams andcolumns in all directions, we insert between the two doubly-corrugatedplates A A a plain, straight, comparatively thin plate, D, correspondingin length therewith, andof such a. width as that its edges shall extendout 'to and beyond the outer cdgesof the corrugated plates. When itis soinserted, the two corrugated plates A :A are united upon thisintermediate binding-plate D, by4 means of rivets passing entirelythrough them all, as seen in lig. 2.

Columns, beams, or girders lso constructed, possesso. maximum ofstrength with a minimum of weight,

`and afford an equal resist-ance to strain, whether of tension, torsion,or compression, vin all directions alike.

.In using the double-corrugated beams, in combination with diagonalbraces C, we insert orpass the braces C between the oppositedoubly-corrugated plates A A, forming the same, instead of the plainbindingplate 1),'jnst described, either omitting said plate Dentirely,or so cutting it awayas to leave the space required forth? insertionofthe stays. This mode of combining the stays with the'supporting-columnsand vboiunsot' bridges, and similar structures, avo'iils allyneccssityof cutting or weakening thevlatter, and affords o. very strong`combination of the two, increasing grcatlythe strength 'of the entirebridge, roof, or other structure-.zf Y 'A "6in1:V improved columns aresupported at their lower endsby heavy plates or pieces, 'sogroove'd'nsto i .becomecounterparts of the corrugated' plates'ot` thecolumn. They nret'ted against-these plates 'attheir base, and drawntogether thereon'by means ofbelts and nuts, as illustrated in ig. l

Transverse bolts are also inserted through the hed-plates, to passthrough the folds of the corrugated 4u rivht lates formin the column,and e. ver stronv, sure combinationl of the same with the base orfounda- P p P te y s tion thereof is thusl obtained. v

Having thus fully described our invention, we claim therein as new, anddesire to secure by Letters Patente- The'combina'tion, substantiallyasand-for the purpose herein set forth, of 'an intermediatebinding-plata,

A D, with vthe doubly-corrugated'plates A, forming the double-corrugatedbeams and columns herein described.

,We claim-also, in the construction of bridges, roofs,l and similarstructures, with double-corrugated beams und columns, the combination ofdiagonal strays and braces withA said beams and columns, by passing theStays or braces between the opposite platee of the beams and calumnia,substantially in the manner and for the purpose herein set forth.

Theforegoing specification of our improvements in corrugated-metalstructures, signed by us, this 22d day of July, 1868. v

R. MONTGOMERY, MARY J. MONTGOMERY.

Witnesses:

DAVID A. Brum, 1 H. H. .YOUNW }us. to RICHARD MONTGOMERY. H. TLMcILwAIN,

JOHN CRAWFORD, us to MARY J. MoNTooMEnY.

